Railway traffic controlling apparatus



OCt. 13, 1931. R- M G|L5ON l1,827,391

RAILWAY TRAFFLC CONTROLLING APPARATUS Original Filed Oct. 28, 1930 INVENTOR I /Qff/e ATTORNEY i fBOBERTf M. GISONQOF; PITTSBURGH, PEiNsYLvANIA,f assienonrof tin/1on1A Venn, iaaitnsfzLituanie,y i conronarronpr a diagrammatic view illustrating `one form Patented oci., 13, 1931 SWITCH & sletten sois/[renin or swiss -1 ENNSYLVANI AT jfnhinwii mmrrjeeonfrraoztnme firrannmus f Application 'tiedectobrasiao,'seriaiivoi 491,727; A-ltenewei Aprraiaei.

My invention relates to' railway traiiic controlling apparatus, and hasrfor lanjobject the protection of suchk apparatus yfrom excessive currents that might be injurious.; y' l l will describe two forms of apparatus emi nthe accompanying drawings7 Fi'gl l isv of apparatus embodying my invention. Fig.

f 2 is a view showingV a modi-iied'fform of part,`

of the apparatus illustratedfin and Valso embodying my invention.,

' Siinilar reieren'cefcharacters refer to similar partsr in both views. 1

, 'Referring first to-Fig. l, the reference character A "designates a railway switch.A which isA yactuated by an electric motor Mthaving an armature l and a, field-,2. Qperatively 'connected with the switch kare cut-outcontrollers and-CR. Cut out f controller CN com "pisesja' contactiarm' 6 and' a'conta'ct, and

controller CRcompris-es a contact'arm 3y and a contact 4'. Contact 6-f-7 remains closed at Aailtimes v'e'xceptwhen the switch is in the' i, `full'reve'rse position, and contact'l-iv relmains closed at all times except when the y switch is in thefull normal position. i Y

vl`l 1e motor M 's controlled 'in part by a 'circuit controllerP 4Which'isin turn convtroll'ed by sticlcrelays 76v and '49. `'The circuit controller Pcomprisesanelectrofmag!y "'ne't' 9, made up of'tw'o windings V9.a and 9b, anda ypolarized winding' 10 which isprefe'rf ably providedwith aste'el permanently magnetized core 1l. 'Pivotally attached to the V core ll is an armature 12.which is therefore i polarized by flux rfrom the permanent magnet at suchftimes yas winding 10 is not carrying current; It'foll'ows that ,whenthe core ll electrofmagnet 9 is Vsupplied with currentof .fonepolarity'the armature l2-willfbeV swung ina clockwise "direction-, but that when lcur- `rent ofthe yopposite polarity is supplied lto.

electromagnet 9` the armature will be swung inthe opposite direction; yThe 'armature-12 and 15 through suitable linkage, in lsuch gized. Pivotallyattached to the armature 11T isa-link 19 lprovided with a`slotvi3 whichat As shown inthe drawings, the'switchfA 'handpositions when the armature is'swungy 'Y ce Etimes engages apinl42 in a rocker Aarinf'O i y:which carries alcontact linger 20. WhenmagV f f net B is deenergized, the link19 moves the rockerarm 7 0 lagainst the bias exerted by. a ySpringfest into a position in which the Contact 4 linger 12() connects wire 33 with Wire 34. Whenneutral magnet B is energized, how! ever,the springaurgestherocker arm-7() '-into f a" position wherein the contact between a Wires 33 and 34 isinterruptedj. @is 'Y occupies its normal position, and the neutral magnet Bis deenergized thereby locking arf V,mature 12 'oficircuitcontroller Pin its leftf hand' position v The apparatus thus vf aireferred to is illusktratedfa'nd described infUnitedStates Letters Y .Patent No. 1,722,364v granted to Henry- 'S. i -Young on ,the 30th day vof J uly, 1929 for railvway traiiic controllingapparfatus f Y The reference character vR- designates an automatic thermal overload circuit breaker.' The .circuit breaker-'R comprises av primary l core 25 on which isa winding 23, and a sec ondaryvv core 24v onv which isawinding 28.

Winding23 is connected, ,inseries with the `motor vcircuitso thatit carries the entire motor circuit current.y I One end-of Winding 28 fisfconnected to a commonterminal for conta'cts36 and 32 ofstick relays-76 and 49,;k relspectively, and the other end isconnected to terminal C Hk of arsourcefoifcurrent. The o heating ywindingsS Vand 5- ofv two' thermal re-4 jlays y.T1 and T, respectively, are'connected in series lwith the reverse and thenormal motor circuits, respectively, sothat the motor cir-v lcuit 'currentis carried byjone ofthesevvindfl controls three -rpivoted contact yokes 1 3, 14"

seriesl with relays 491and 76,-respectively, so

lll

that it either contact opens, the corresponding relay Will be deenergized. Stick relay 76 comprises a Winding 48 and contacts 46, 78 and 36, While stick relay 49 comprises a Winding 47 and contacts 41, 40 and 32. Contacts 46 and 41 of relays 76 and 49, respectively, are included in the stick circuits ot the re.` lays, While contacts 78 and 49 change the polarity of the current supplied to polar relay l), and contacts 36 and 32 control the tloW ot current through Winding 28.

The parts of the circuit breaker are so designed that as long as coil 28 is energized the maximum amount of current that can be draWn by the sWitch motor, passing through coil 23, Will not attract the armature 21 of coil 23 against the action ot coil 28 on ariiiature 26.

' rlhe motor circuit, When the sWitch is to be moved to the reverse position, is from terminal BH, through Wire 7-1, Wire 33, Contact finger 20, Wire 34, Winding 23, Wire 65, Wire 16, yoke 13, flexible connector 67, Wire 50,'

armature 1, Wire 51, flexible connector 66, yoke 14, Wire 52, Winding 8 ol thermal relay T1, contact 7 ,contact 6, Wire 62, Wire 64 and ield 2 to terininalCl-l. The pick-up circuit Y for 'stick relay 76 is from Wiie 53, through Winding 48, Wire 72, contact 74 andcontact of thermal relay T to terminal CH. The stick circuit 'for the sanie relay is from Wire 54, through contact 46, Wire 59, Winding 76, Wire 7 2, contact 74 and contact 75 to terminal VJhen the sWitch is to be moved to the normal position from the reverse position, the motor circuit is from terminal BH, through Wire 71, Wire 33, contact 20, Wire 34, Winding 23, Wire 65, Wire 68, yoke 14, flexible connector 66, Wire 51, armature 1, Wire 50. lleiible connector 67, yoke 13, Wire 29, Winding 5, Contact 4, Contact 3, Wire'63, Wire 64 and ield 2 to terminal CH. rThe pick-up circuit liorrelay 49 is from Wire 55, through Winding 47, Wire 73, contact 38 and contact 37 of thermal relay T1, to terminal CH. The stick circuit for the saine relay is from Wire 56, through contact 41, Wire 58, Winding 47, Wire 73, contact 38 and contact 37 to terminal CH.

The holding coil 28 is connected across the iield 2 of motor M through Wire 64, Wire 62, ire 61, either Wire 31 or 35, either Contact 32 or 36, depending on the contact picked up, Wire 30 and Winding 28 to terminal GH Which is a common terminal Jfor the holding coil 28 andv field 2.

TWhen relay 76 is deenergized and relay 49 is energized, neutral magnet B is energized by current through the circuit z from terminal BH, through Wire 79, contact 40, Wire 95, yoke 15. Wire 93, neutral magnet B and Wire 94 to terminal CH. W'lienarmature 17 is attracted due to the energizatioii ot neutral magnet B through this circuit, current Will tloW through polar relay P 'from Wire 95, through Wire 96, contact 97, Wire 98, Winding 9a, Wire 99, Winding 9", Wire 100, Wire 60, contact 78 and Wire 45 to terminal CH. When relay 49 is deencrgized and relay 76 is energized, neutral magnet B is energized by current through the circuit: 'from terminal BH, through Wire 7 7, contact 78, Wire 60, yoke 15, Wire 93, neutral magnet B and Wire 94 to terminal When armature 17 isl attracted due A to'- the energization of neutral magnet BA through this last circuit, current Will flow through polar relay l) froinivire 60, through Wire 100. Winding 9b, Wire 99, Winding 9, Wire 98, contact 97, Wire 96, Wirel 95, contact 40 and Wire 39 to terminal CH. l

ln describing the operation of the apparatus, l Will assume it is desired to move the sWitcli A to the reverse position. Stick i'elay 76 is tirst deenergized and stick relay 49 is energized through its pick-up circuit by a suitable device not embodying my inventi-.in and not shoWn in Fig. 1. Contacts 46, 78 and 36r drop and contacts 41, 40 and are picked up. Neutral relay B is energized because its Ycircuit is closed at contacts '79-4O and armature 17 is attracted, thus,

closing suitable contacts to energize and change the polarity of the` current supplied to polar relay P. Armature 12 then mores to the right, inovingyokes 13, 14 and 15 'to the left, closing contacts Which complete the reverse motor circuit When armature 17 becomes released to connect Wires 33 and 34 through contact finger 20. The sWitch noW moves to the reverse position. lf an obstruction occurs in switch A. the motor current Will rise above Vthe value necessary to operate relay T1, and Contact 37--38 opens, opening the stick circuit of relay 49. Relay 49 becomes deenergized because the pick-up' circuit isv also open,I and so Contact 31-32 Will open, opening the circuit of the holding coil ith the holding coil deenergized,

'armature 21 is attracted by energized coil 23 and dctent 57 is raised, raising link arm 4accoinp shed by energizing stick relay 76 through its pick-up circuit, and When contact 46 ispicked up, therelay is energized through the stick circuit. Contact 77-78 then closes the circuit for neutral relav B Which attracts armature 17 and moves 'link arm 19 so that slot 43 engages pin'42. Suitn ahlelcontacts are closed When armature 17 is attracted to energize and change the polaroi the current supplied to polar relay P. n. mature 12 then inoves to the lett, moving :es 13,14 and 15 to the right, closing coni vtacteWhichf'coniplete thezrn'otor circuit for ,Y

' "rotatioii in theoppositeY direction-.'When armature117iskkreleased to'connect Wires 38 and y34 :through contact' linger 20.*. Whe-n the switchffreturns to ythe normal position, the

reverse operation may ,berepeated as first kde-v scribed, as sodonas contact 37-38 of thermal y y'relay T1 cools sufhcientlyto close.

In ya Similar mannerif 'the switch to be moved from. thereverse position -to lthe normal, thefstickrelay' 7 6 is energized and contacts 46; 78 andareipicked up'as shown' 'Lon the drawing. Neutral relay Bis venergized. and armaturel 17 is attracted', thus closing contactsfto energize andchange 'the polarity 'of ythe current supplied Vto polar relay E. nArm'atur'e 12 ,thenl moves to the' lett, `movingL yokes`13, Hand to the righuclosing conetacte Whil chv complete the `normal injotor cir- Hsnit"Whenarmature 17 isr`eleased to connect `VrWires and 3ft through vcontact finger l'The "sWitchl noW moves to 'they normal posi- 'f'tion I'tan yobstruction occure in switch A, "the motor" current. wWill rise above the valuel necessaryfto ,operate `relay 7 v175 opens,v opening` 'the' stick circuit I relay'v76. Relay 76jis deenergized because the f e-36 opens, opening the'circuit ofthe hold coil`28. gized, armature pick-up ,circuiti is alsogr'ipen,A and contact v With:L the holding coil 'aleen-en Rocker arme then moves'tothe right due 'tf1 they bias exerted *by cempressedqspring 44,

eition. Controller yP isreset by energiz-insr andWhen'contact,415ispiclred up the relay i *isenergizedthroughthestick circuit. rContact 40 closes the circuit 'for'.energizing'neuftral relay-B Which attractsfarmature 17 land moves link arm l19Go thatjs'lot leiigages pin 12. YSuitable, contacts are' Aclosed When armature 17fi's attracted "t energize and change the polarityv of the current supplied to polar relay Armature' then'moves to'theright,-moving`yokes'13, A14-` and '1 5 to theleft. closingcontacte AWhich complete the motor circuit for reverse rotation Whenarma- "ture 17 is released. `Vlienthe'switch moves i tothe reverse position, ythe operation may Vbe iepeatedas'before described, asvsoonlae conn l"tja ct-f 7 4 7 5 of :thermal relay T- cools-Sullicicntlvv to close,rv

Referring noWto y "the motor M *are the vsame as -before,but con- Ytroller PF is energizedfand its,y polarityr vis *changed a polarized relay v8O instead of' the tivoetick1 relays 7 6? and 495,111 Fig.'y 1. the

operation ot one ofthe 'thermal relays Willl ,rleeniergi ze the `a`slsoci ated 'stickfrelay and thus T land Contact 21 "isvvattracted ,byf'energize'lf coil 23fand detent 57 ieraieed, raising link" arm 19 and disengagingfslot 413f-frompinj42:

. TheY operati F the circuitsor v y Y f thermal relay torthat direction has cooledoff u 'y sor as vto completeV the holdingfcoilcircuit;l'if f thermal 4relay operates. .y f v .The ,holdingv coilx28 i is i connected-v across field 2 of motor M by either one of two cir` 'opentliielholding coil circuit, Whilein ligj2r y the holding. coil' circuitropens 4When either 'zo i cuits depending on the position ,ofV contact 89 ofi polarized `relaySO. When sWitchVjlArfisk 38,vr Wire178contact-89, -Wire k30, *l Wind-ing.28

and toter'minal" CH Which is a common termi#` .nal for-the holding coil 28landieldn2ffv 'When switch is "moving to. thev normal ,positiorh theV holding1lcoil285ie connected acros'sffield 2l through'wirel, Wire 63W'ire 71, contact k7 5v, contact 74,2*Wire 72, Contact 89,1vvirek 30and Windingl 285to terminal CELk v Y Y j fllhenQ-Winding 81 o-fpolar relay V80 =is yenergized by current of such'y polaritythat 'thepolarcontacts 87, 88 and 89 -move to :the

rijghhw neutralimagnet BY vWillbe lenergized [through a circuit Jfrom terminal BH, throughy f contact- 872', Wire 83,;contact 87,"Wir.e 9,0, wire- '915, yoke 415,2Wire93,l neutraly magnet B and Wire 94 to'terininal GH? yWhen armature-17 isA attracted magnet B through this circuit, current Will tlovvV throiigh l.polar relay vP romwire95, throughvwire 96",contact` 97, vWire' 98,V Wi ndingf9`5 "9, Wire 99,'Windingz92lwire1100,1Wire 60, Wire due tothe energizationv of neutral 92, contact 188,7Wire V84 andV contact y85 totermi-y tral rinagnet B is venergized rthrough :thefcir- "moving tothe vreverse position, the holding'n Y Y i V.coil V28is connected across fieldv 2 through 'Wire 64,"wire`62,Wire69, contact 37, contact .nal CH. VVheII 'Winding' 8150i polar relay 80 i is energized'by currentiotsuch' polaritythat thefpolar 4contacte'are;,swung to theleft, nene"v cuit fromterminal BH, through acontact82,

Wire 83, contact 87, W ire",86,Wire 60, yoke-15,

Wire 93,V neutral'magnetfB Vand Wirep94 to terminal CH; When armature .17 is attracted due tothe energization ofneutralinagnet 1 B through thisglastcircuit, 'current,Wi-ll",loivv` except that instead-ofrelays 76 -and i9r controllingftheoperation of the"Y switch yto the reverse andnormal'p'osition as inFig, 1. the

-throughpolarrelay P from Wire'60,' throughVV f l i y Wire 100, WindingfirQhWire;99,'Winding 9a,

' polar'relay,l 80 controlsl the operation of the 'y eWitchinFigEZ. n v fr Vith apparatus (embodying my invention, g

"it is possiblef'to' restore the switch 'movement i to itslaet-"operated' position; immediately Aand tojatternptftov operate vthe moveinentagain in f the directioninivhichit failed-as soon-as the VAlthough I have hereinl 'Shown-rand" de# ing myfinvent'ion, it is-"understoodthat *vari-k *ecribed only two forme'of'apparatus embody; Y l 1 therein'within the scopeV of the appended Y claims without departing from the spirit and electric `motor for operating said. switch, aY

normal and a reverse thermal relay each including a heating winding and a normally closed contact, a normal and afreverse circuit for said motor including theheating windings oi said normal and reverse thermal relays respectively, two circuit controllers, one included in said normal circuit and closed in all positions o' the switch except the reverse and the other included in said reverse circuit and closed in all positions of the switch eX- cept the normal, a circuit breaker having a first and a second core for controlling the supply oi. current to said motor, a winding on the first core of said circuit breaker included in both of said circuits and constituting a means for tripping said circuit breaker, a holding` winding on the second core oi' said circuit breaker connected across the field of said motor and when energized acting to preventtripping of said circuit breaker, a normal and a reverse stickrelay for closing one or the other of said circuits to cause rotation ot the motor in one direction or the other, and a vpick-up and a stick circuit for each of said stick relays each circuit including the contact ot' the associated thermal relay.

2. In combination, a railway switcln an electric motor forioperating said switch, a normal and a reversel thermal relay, each including aheating winding and normally closed' contact, a normal and a reverse circuit lfor said motor includingcthe heating' windings of said normal and reverse thermal relays respectively, two circuit controllers one included in said normal circuit and closed in all positions of the switch except the reverse and the other included in said reverse circuit and closed inail positions of the switch eX- cept the normal, a circuit breaker having a first and a second core torcontrolling the supply of current to said motor, a winding on the first 'core' of said circuit breaker included in both of said circuits and constitut- K ingl a means for trippinv said circuit breaker, a holding winding` on the second core of said circuit breaker connected across the field of said motor and when energized acting to prevent tripping of said circuit breaker, a polarized relay including a polarized contact, and two circuits for said holding winding each including the contact of one of said thermal relays and each circuit at times including said polarized contact depending` on the position ofthe contact due to the polarity of said polarized relay. l

3. In combination, an electric motor, a normal Vand a reverse operating circuit tor said motor, a circuit breaker vfor controlling said relays or the other.

the supply of current to said motor having a first and a second core, a winding on said first core included in both of said motor circuits and constituting a means for tripping` said circuit breakeija holding winding on said second core acting when energized to prevent tripping oi' said circuit breaker, a normal and a reverse relay for energizing said holding winding and for closing one or the other or" said motor circuits to cause rotation of the motor in one direction or the other, and governing means included in each of said motor circuits and responsive to the magnitude of the currentl supplied to said metort'or governing one of said relays or the other. v

4. In combination, an electric motor, ay normal and a reverse operating cir-cuit for'said motor, a circuit breaker for controlling the supply of current to said motor, a first winding included in both of said motor circuits andl constituting a means for tripping said circuit breaker, a second winding acting when energized to prevent tripping of said circuit breaker, a normal and a reverse relay tor energizing said second `winding and for closing one or the other of said'motor circuits to cause rotation of the motor in one direction or the other, and governing means included in each of said motor circuits and responsive to the magnitude ot' the current supplied to said motoror governingon'e Yot 5. In combination, an electric motor, `a normal and a reverse operating circuit for said motor, a circuit breaker for controlling the supply of current to said motor having a tirst and a second core, a winding on said first core included in both of said motor circuits and constituting a means for tripping said circuit breaker, a holding winding on said second core acting when energized to prevent tripping of said circuit breaker, a polarized relay including a polarized contact, two controlA circuits for said holding` winding each circuit at times includingl said polarized Contact depending on the position of the vcontact vdue to the polarity Vof said polarized relay, and governing means included in each of said motor circuitsfand responsive to the magnitude of the current suppliedto the motor for governing one ot' said control circuits or the other.

6. In combination, an electric motor, a normal and a reverse operating circuit for said motor, a circuit breaker for controlling the supply of current to said motor, a first winding included in both of said motor circuits and constituting a means for tripping said circuitbreaker, a-second winding acting when energized -to prevent tripping of said circuit breaker, a polarized `relay including a polarized contact, two control circuits for said second winding each circuit at times including said polarized contact depending onthe'position.. of the contact due tothe ipo-` larityy :of said polarizedrelay, and 'governiing means includedinzeach kof said motor circuits and responsive to the magnitude of the current supplied to the m0t `irQzEor governing ,oneof said control circuits orthe other.

7. In combination,` an*y` yelectric motor, .a normal Aand ay reverse, operatingy circuit .for

vsaid motor, a circuit breakerv for controllingl the supply of current to said'motor having .a first. and a second core, a `winding on`l said first coreincluded in both ofsaidmotor circuits and constituting al ineans for :tripping lsaid, circuit'breaker, anormal and a 'reverse relay for closing oneorA the other otr said motor circuits, respectively, v to cause rotation of the motor in one direction or Vthe other, means .controlled iii'turn by one'ortlie otherot` said relays for governing the luX iiisaid second core tol prevent said circuitwbreaker from i tripping, and governing meansincludedin each of said motor circuits andfrespoiisive yto the magnitude ofthe current` supplied to said motor for governing one of saidrrelays or they other. Y

8. In combination,l an electric motor,a

normal and ar'reverse operating circuit for lsaid motor, a circuit breaker tor controlling the supply of current lto said motor having a first and a second core, a winding oii'said' first core included lin bothfof'said motor cir# cuitsand constituting a means for tripping said circuit breaker, a'polarized relay include ing vay polarized contact, means for governing the flux in .said'second 'core to prevent said circuit breaker from tripping, two control circuits for said means,'each circuit atvtimes including saidy polarized contact depending' on the position of they contact due to the po-V larity of said lpolarized relay, and govern-V ing means included in each of said motor cir# normal and a reverse thermal relayeach inl cluding a heating winding and a contact, a

normal and a reverse'circuit forfsaid motori includiugthe heatingwindings of said'nor# vmal and reverse Athermal relays respectively`,}

two circuit controllers, one included in said normal circiiit"a nd closed in all piorsitionsof. theswitc'h except the reverse and the other included iiir said reverse circuit andclosed in f all positions of the switch-except the "normal,

, acircuitbreaker having a'tirst andy a second i core for controlling the supplyiof current'to-- i :laid motor, a Winding on the rst core otsaid circuit breakerl includedv in both of saidcir-v cuits and constituting a meansjfor. tripping cuit breaker, La;l normal -andfa reverse relay v'for closing one or the other osaid circuits,

respectively, to cause rotation ofthemotorin one direction or Vthe other,arid.a pick-up4 cir`v cuit tor `each ot said relays,;eachcircuit controlled by the 'contact-ofthe tl'ierinalrelay lassociated therewith; I I

10. In combination, lanfelectric motor, a,

normal. and a .reverse 'operating' circuit for said motor, a circuit breaker for. controlling the'supply of current to said motorfafirst winding included in :both of said motor cire cuits and constitutinga means 'for' tripping said circuithreaker, a second winding circuit breaker, a normal and a reverse relay `torenergizing said second winding and for closing one or the other of said-motor circuits to cause-.rotation ofthe motor in one direc. tion orV the other,rand thermal means .included in each or said motor circuits and responsive or the other'.

.11. I-n combination., a' electric motor, a norv acting whenenergized to prevent tripping ofsaid tothe magnitude Yof the current supplied to .said motor for,A governing one of said relays mailand a reverse" operating circuit forsaid inotor, a. circuit breaker for; controlling the supply of current to said motor, apfi'rsti'wind'- f ingincluded inboth of said motor circuitsf andfcons'tituting a means fortrippingsaid circuit, breaker, a second winding acting when energized to prevent trippingoif` saidfcircuit f breaker, a polarized relay including a polan-y ized contact, two control circuits or-s'aidsec# ond/winding each circuit at ytimesincluding j' said polarized-contact dependingon the posi` tion o fthe contact dueto *thel polarity of said polar-izedrelay, and thermal means included in eachof said motor circuits andlr'esponsive vrto themagnitudefoic the current@ supplied to the:v motor vfor governing one of saidrontrolf Y* circuits orti-ie other.

-^ v 12.In combination, fanelectric motor,l aii operating/circuit for said'motor, Ya circuit` vbreaker for controlling the supply of current to said motor, Ya vtripping' .winding included y in said motor circuit and constituting afmeans for'trippingsaid circuit" breaker, a 'holding' windingacting when energized to'pre'vent l' saidl circuit :breaker 1 from tripping, a' relay for governing said operating circuit andffor energizing said holding winding, and means includedI in said'motor circuitand responsivey vtoit-lie inagnitude of lthe 5 current suppliedito, f ysaid -motor :tor governing said'` relai'r:A

'orvtripping said circuit breaker, a' holding fromv tripping, a rela'y'iory governingsaid i operating circuit and for. controllingfsaid" holding winding,`-y andv means included ii'saidj -7 15:11.32@ Incombination, anelectric motion-an mi v 'operating circuit'v forkk said motor, a, circuit` breaker for 'controlling the supply of 'current` tosaid motor, ya tripping windingA included insaid motork circuitand constituting-a rneansjl said circuit breaker, a holding :Winding on the windingfa'ctiiig to prevent said'ci'i'"cuitbreaker A ksecond core of said Vcircuit breaker connectedV ,across the'iieldy of said motor andy wheri'energized acting to 2prevent t'rippiiigof said cire motor circuit .and responsive to the magnit-ude :of the current supplied to said motor for modifying the-control oi' said holding Winding by said relay. Y

le; ln' combination, an electric motor, an operating circuit for said motor, a circuit breaker for controlling tlie supply of current to said motor, a 'tripping Winding included in said motor Vcircuit and constituting a means for tripping said circuit breaker, a holding Winding` acting when energized to prevent said circuit breaker from tripping, a relay for governing said operating circuit and for energizing said holding Winding, and means responsive to the magnitude of the current supplied to said motor for governing said relay.

15. In combination, an electric motor, an operating circuit :for said motor, a circuit breakerior controlling the supply of current to said motor, a tripping winding included in said motor circuit and constituting a means for tripping said circuit breaker, a holding Winding acting to prevent said circuit breaker from tripping, a relay for governingy said operating circuit and for Controlling said holding Winding, and means responsive to the magnitude of the current supplied to. said motor for modifying the control of said holding Winding by said relay.

16. In combination, an electric motor, an operating circuit for said motora circuit breakerfor controlling the supply of current to said motor having a first and a second core,

an operating Winding on said first core included in said motor circuit and constituting a means for tripping said circuit breaker, governing means for governing the flux iii-said second core to prevent saidcircuit breaker from tripping, a relay for controlling said operating circuit and said governing means, and means included in said motor circuit and .responsive to the magnitude oiu the current governing means for governing the fluir inV said second core to prevent said circuit breaker from tripping, a relay for controlling said operating circuit and said governing means, and means included in said motor circuit and responsive to the magnitude of the current supplied to said motor for modifying the coii-l trol of said governing means by said relay.

18. In combination, an electric motor, an operating circuit for said motor, a circuit breaker for controlling the sup illy or current to saidniotor having a irst an@ i second core, anl operating `Winding on sai( tiist core in` cluded in said motor circuit and constituting a means for tripping said circuit breaker, governin-g means tor governing the flux in said second core to prevent said circuit breaker from tripping, a relay for controlling said operating circuit and said governing means,

and meansV responsive to the magnitude of the Y current supplied to said motor for modifying the control or' said governing means by said relay. Y

In testimonyY whereof atlix my signature.

sonner M. unison.

an electric motor, anV 

